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Abstract

Efficient surface gratings are UV imprinted in an acrylate-rich
hybrid solgel glass. Structural changes occurring in the material
upon exposure to light are investigated. Large amplitude modulation
(700 nm) and low surface roughness (0.2 nm) were measured by
atomic force microscopy. Diffraction efficiencies were found to be
close to theoretical predictions. The method of fabrication
does not involve any etching step, and an all-UV process is
proposed. The gratings are resistant to temperature and to solvent
effects. These devices could have useful applications in sensor and
spectroscopic devices.

References

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Table 1

Comparison between Computed and Experimental Values of
Diffracted Efficienciesa

Surface Gratings

Volume Gratings

Experimental Values

Computed Values (Δh = 760 nm)

Experimental Values

Computed Values (Δn = 0.012)

η0 (%)

7.5

8.2

97

95

η1 (%)

34.2

34.9

1.3

2.4

η2 (%)

10.3

10.9

a Δh is the amplitude of the
surface corrugation, and Δn is the photoinduced increase
of the film refractive index. The following data were used for the
computation: wavelength, 0.6328 µm; film index, 1.507.